质子交换膜燃料电池
阴极
介电谱
浓差极化
极化(电化学)
分析化学(期刊)
相对湿度
湍流
压力降
材料科学
功率密度
电流密度
半径
化学
膜
机械
电化学
热力学
电极
功率(物理)
色谱法
物理
生物化学
计算机安全
物理化学
量子力学
计算机科学
作者
Liang He,Ming Hou,Yanyan Gao,Xiaofeng Sun,Wei Song,Liming Zheng,Jun Ai,Hongjie Zhang,Zhigang Shao
标识
DOI:10.1016/j.enconman.2020.113292
摘要
Flow fields play an important role in performance enhancement of a Proton Exchange Membrane Fuel Cells (PEMFCs). However, the weak mass transport ability of the conventional parallel flow field seriously affects the cell performance, especially at high current density. In this work, a series of S-shaped flow fields are designed and experimentally verified. The effects of key design parameters, such as the S radius (R) and the S length (H), on the cell performance are investigated in detail by recording the polarization curves under different cathode relative humidity (RH) levels and stoichiometric ratios. The results indicate that the small R and large H are beneficial to the promotion of cell performance owing to the increased turbulence and decreased liquid water content in the cell, which is also proved by the electrochemical impedance spectroscopy (EIS). However, the pressure drop significantly increases at the same time, which affects the output ability of the cell. Considering the net output capacity and the processing processing possibility, the cell with the S radius of 17.4 mm and the S length of 40 mm exhibited the peak power density of 1.02 W cm−2, with 15% higher than the CPFF (870 W cm−2).
科研通智能强力驱动
Strongly Powered by AbleSci AI